44
INSTALLATION INSTRUCTIONS
A, B, C, D
Vent Pipe
Through Roof
NOTE: Only manufacturer-approved termination and parts should be used during installation.
The following chart with diagrams details the minimum dimensional information needed to determine the proper location
of the vertical vent terminal for direct-vent indoor tankless water heaters:
Location
U.S. Installation
Requirements
1
Canadian Installation
Requirements
2
A = Minimum clearance above the roof level.
12 in. (30.5 cm) above roof level.
18 in. (45.7 cm) above roof level.
B = Minimum clearance above anticipated snow level.
12 in. (30.5 cm) above
anticipated snow level.
12 in. (30.5 cm) above anticipated snow
level.
C = Maximum clearance above roof level (without ad-
ditional vent support).
24 in. (61 cm) above roof level.
24 in. (61 cm) above roof level.
D = Maximum clearance above anticipated snow level
(requires additional vent support).
24 in. (61 cm) above anticipated snow
level.
24 in. (61 cm) above anticipated snow
level.
E = Required vent clearance from any gable, dormer, or
other roof structure with building access (i.e., vent,
window).
4 ft. (1.2 m).
4 ft. (1.2 m).
F = Required vent clearance from any forced air inlet,
including dryer and furnace air inlets.
10 ft. (3 m)
6 ft. (1.8 m)
1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2 In accordance with current CAN/CSA B149.1 Installation Codes.
Venting
Vertical Vent Terminal Location
Venting for Direct-Vent Water Heater (cont.)